在r中循环多个字符串

Question

我有一个Json格式的多行txt文件。

我想将每个字符串分隔成一个新的txt文件。我知道如何分开每个字符串（下面），但我有大约65个字符串，因此循环是首选。什么是最好的前进方向？我这样做的原因是因为我想操作列表格式的元素。

string <- file("small copy.txt", "rt") 
class(string) 

#Looping (Step 2) 
a <- readLines(string, 2) 
a 

# Save to a new text file 
fileConn <-file("new.txt") 
writeLines(a, fileConn) 
close(fileConn) 

# read the new Text file. 
json_data <- fromJSON(file="new.txt") 
class(json_data) 
unlist(json_data) 

我不能再添加行，因为它太长了。但是每个字符串都是这么长。只有值才会改变。结构是一样的。我想知道如何循环这个过程，让我有一个新的文本文件，每个文件都有一个字符串。

" 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

Answer 1

您很可能不需要写入文件并从中读取文件。 fromJSON可以将字符串作为输入。

现在为了在保留list格式的情况下遍历列表，方法就是lapply。 我没有任何JSON文件来测试它，但是这应该工作：

a <- readLines("small copy.txt") 
json_data <- lapply(a, fromJSON) 

这也是令人惊讶的是你的代码的最后一步是当你说你想“操纵，以不公开的数据元素作为列表格式“。

Answer 2

谢谢SRenan，我设法解决了我的问题，并在您的帮助下缩短了我的工作流程。不知何故，R回复说那是空的。

a<- readLines("small copy.txt") 
json_data <- lapply(a, fromJSON) 
Error: no data to parse 

但我添加了paste（），并且运行良好。出于某种原因，它在转换为字符后将矢量连接在一起时起作用。

a<- paste(readLines("small copy.txt"), collapse="", sep = "\r") 
json_data <- lapply(a, fromJSON) 
class(json_data) 
[1] "list" 

我不知道为什么，但它解决了我的问题！